EmergencyCryptkeeperText: Make sure we update if airplane mode changes

package com.android.systemui.statusbar.policy;

import android.annotation.Nullable;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

public class EmergencyCryptkeeperText extends TextView {

    private KeyguardUpdateMonitor mKeyguardUpdateMonitor;

    private KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {

    private final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {

        @Override

        public void onPhoneStateChanged(int phoneState) {

            update();

        }

    };

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(intent.getAction())) {

                update();

            }

        }

    };

    public EmergencyCryptkeeperText(Context context, @Nullable AttributeSet attrs) {

        super(context, attrs);

        super.onAttachedToWindow();

        mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(mContext);

        mKeyguardUpdateMonitor.registerCallback(mCallback);

        getContext().registerReceiver(mReceiver,

                new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED));

        update();

    }

        if (mKeyguardUpdateMonitor != null) {

            mKeyguardUpdateMonitor.removeCallback(mCallback);

        }

        getContext().unregisterReceiver(mReceiver);

    }

    public void update() {